Neutron Diffraction in Dilute and Semidilute Polymer Solutions

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Abstract
The small angle scattering of neutrons by dilute polystyrene molecules has been measured for concentrations c between 10−3 and 10−1 g/cm3. With these very low c values we can explore two different regimes: (1) A ``semidilute'' regime where each coil interacts with many others; (2) a dilute regime, where the coils are separated. There is a striking difference between the angular patterns observed in case (1) and in case (2). They can be interpreted in terms of calculations by Flory for the dilute end, and by Edwards in the semidilute end.